Yantra tattooing is a form of tattooing originally introduced by Khmer people of the Khmer Empire which influenced much of its culture in the region during its reign. It consists of sacred geometrical, animal and deity designs accompanied by Pali phrases that offer power, protection, fortune, charisma and other benefits for the bearer. These days, it remains popular in Thailand. Sak means tattoo in Thai, and yan is the Thai pronunciation for the Sanskrit word yantra a type of mystical diagram used in Dharmic religions. Sak yan designs are normally tattooed by ruesi (the Thai form of rishi), wicha (magic) practitioners, and Buddhist monks, traditionally with a metal rod sharpened to a point (called a khem sak). Yantra tattoos are believed to be magic and bestow mystical powers, protection, or good luck. There are three main effects of a yantra tattoo. One is that which benefits the wearer, such as making them more eloquent. Another is that of protection and to ward off evil and hardship. This is commonly used by military personnel, police, taxi drivers, gangsters and others in perceived dangerous professions. Another type is that which affects people around the wearer, such as invoking fear. The tattoo only confers its powers so long as the bearer observes certain rules and taboos, such as abstaining from a certain type of food.